Originally Posted by AdrianM
Not sure whose compounds you are referring to here... I am assuming you may be referring to BSR, as you have them listed in your signature(although the only Platinum Ive ever seen was made by TRC). If so...
BSR's White compound is equivalent to the other manufacturer's (CRC, etc) Yellow. BSR's Pearl White is equivalent to the CRC White.
The BSR Pearl White/CRC White compounds are generally considered to be ~25duro... a fair bit softer than the the BSR White/CRC Yellow.
Chrome Front - Magenta with a Black Outer Ring
Gray Low Rear - Yellow with a ring of gray
Orange Rear - Yellow Magenta (I think)
Chrome is the CRC version of the BSR Grey/Silver. It is ~70% Grey on the inside, with a ring of Silver(a synthetic, low rubber content foam of similar durometer to Black... but it is apparently from a different family of foam) on the outside.
As previously stated, Orange is the Jaco equivalent of the CRC GreyLow/BSR Gray/White.